Derrick structure for oil, gas, and artesian wells



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FILED ocT. 15, 1921 DERRICK STRUCTURE FOR 01L. GAS, AND AR'n-zsmu Hams.

INVENTOR ATTORNEY.

9 SHEETS'SHEET 6 G. BATTELLE ET AL. DERRICK STRUCTURE FOR 0: L, GAs, AND ARTESIAN WELLs. Fl LED ocr. 15. I921 FIG. 18

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G. BATTELLE ET AL.

ATTORNEY.

G. BATTELLE ET AL. DERRICK STRUCTURE FOR OIL. GAS. AND ARTEsIAN WELLS.

9 SHEETSSHEET 8 FILEDIOCF- 15,1921- IN VEN TOR.

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. BY Q A TTORNEY.

Patented Dec. 26, 1922.-

urrso STATES [PATENT OFFICE.

GORDON BATTELLE, HARRY M. RUNKLE, AND WILLIAM B. TOBIN, OF COLUMBUS, OHIO, ASSIGNORS TO THE INTERNATIONAL DERRICK AND EQUIPMENT COMPANY, 01 COLUMBUS, OHIO, A CORPORATION 01 OHIO.

DERRICK STRUCTURE FOR OIL, GAS, AND ARTESIAN WELLS. I

Application filed October 15, 1921.

To all whom it my concern:

Be it known that We, GORDON BATTELLE, HARRY M. RUNKLE, and WILLIAM B. TOBIN, citizens of the United States of -America, residing at Columbus, in the county of Franklin and State of Ohio, have invented certain new and useful Improvements in Derrick Structures for Oil, Gas, and Artesian lVells, of which the following is 'a specification. I

Our invention relates to derrick structure for oil, gas and artesian wells and has to do with the provision of a noveltype of derrick structure that has many advantages both in the cost of erection and maintenance.

, It also results in important efficiencies and economies for the oil. operator so that the cost of derrick installation for any given set of derricks will be very greatly decreased and the derrick service greatly increased.

In the past in the use of derricks for the purpose indicated above, it has been the practiceto initially vbuild a derrick of comparatively heavy structure necessary for drilling. tain difiiculties due to the comparatively heavy parts and the handling of the same. In most instances, these derricks have been allowed to remain in position after the drilling operationand used during the pumping operation until destroyed by the elements or until their use becomes impracticable because of weakness or threatened destruction, when theylare replaced by a lighter derrick. On the other hand, it has been frequently found that the heavier derrick presents too great a wind hazard, so that as soon as drilling is completed it is practically necessary to tear down the drilling derrick and to replace it with a lighter derrick for pumping and of a structure to minimize this wind hazard.

Furthermore, the use of a derrick of drilling or heavy construction represents an unnecessarily large investment in its continued long use during the pumping stage of the well, and it has been the practice,

This, infitself, has presentedcen Serial No. 507,822.

auxiliary unit or tower, which are both specially constructed with relationto'each other In order that the auxiliary unit may effectively reenforce the main unit for heavy duty and yet may be removed from this mam unit without detracting from the value. and effectiveness ofthe main 'unit for lighter work. In this respect, the structure Another object of our invention consists in the provision. of a derrick structure wherein the loads on the various members are distributed directly from one member to another and not through any bolts, rivets or other connecting means between the members. For example, the water table in our structure rests directly on top of the four leg members and the various sections of the leg members are in end-to-end abutting relation and are held in such relation by socket formations. The result is that there is a direct'application of the loads from the crown block to the derrick foundation, through the sectional supporting members and independently of any shear stress resulting from the use of bolts, rivets or other like connections.

Another feature of our invention has to do with the provision of leg sections that are joined together shortly above the girts and that are specially constructed for the reception of specially constructed reenforcing members. The reenforcing members are such that they may be applied one section at a time and by a simple operation.

Still another feature of "our invention has to do with the provision of means for connecting the main reenforcing supports, such means being so constructed in such a-novel improved manner as to give the derrick the maximum possible base area and the maxiexcessive wind pressure.

Various other features of our invention will be apparent as this description progrosses and will be brought out in the claims appended thereto. The various objects of our invention are preferably obtained by the structure illustrated in the drawings -wherein similar characters of reference designate-corresponding parts and wherein- '17-17 of Figure 15 showing the girt and Figure 1 is a front elevation of our combination derrick structure parts thereof being broken away.

Figure 2 is a side elevation of the topart of this structure, showing the method of applying the load from the crown block to the interior and exterior supporting members.

Figure 3 is a detail view of a fabricated inner leg section showing the socket connection used for connecting each leg section.

Figure 4 is a rear elevation of the structure shown in Figure 3.

Figure 5' is a detail view of a fabricated outer leg section showing the preferred socket connection and the filler blocks riveted to the legsection.

Figure 6 is'a rear elevation of the structure shown in Figure 5.

Figure 7 is a detail view of a connected inner and outer leg section showing the man ner of connecting the two leg sections and the staggered relation of their respective joint connections.

Figure 8 is a. detail view taken on line 88 of Figure 9 and illustrating a front and interior view of the structure shown in Figures 9 and 10.

Figure 9 is an enlarged detail view-at connection 9' of Figure 1, showing the con nection between the water table and the interior and exterior supporting angles and the means for securing the exterior reinfore' ing leg to the interior leg at this point.

Figure 10 is an enlarged detail View taken at the connection 10 of Figure 2 andillustrating a side view. of the structure shown in Figure'9. a 1

Figure 11 is a cross-section taken on line 1111 of Figure 10.

Figure 12 is a horizontal cross-section taken on line 1212 of Figure 10 and showing the interior and exterior leg members I and the filler blocks riveted to the exterior leg members.

Figure 13 is a detail view similar to Figure 12 but showing a modified form of our means for securing the interior reinforcing angle and the interior supporting angle.

Figure 14 is an enlarged detail view taken at connection 14 of Figure 1 and showing a means for connecting the exterior rein forcing joint to the interior supporting angle.

Figure 15 is an enlarged detail view taken at connection 15 of Figure 1 and showing the method ofjoining and connecting to interior supporting leg sections.

Figure 16 is a" transverse section taken on line 1616 of Figure 14 sliowing'the interior and exterior strap bars and illustrating the method of connecting two adjacent ends of the reinforcing angles and the interior supporting angle.

Figure 17 is a cross-section taken on line interior leg connection and the manner of reinforcing both. v

Figure 18 is an enlar ed detail View taken at base connection 18 0 Figure 1, and showing the manner of connecting the supporting legs to form the strong base construction.

F igure 19 is a detail side view of the structure shown in Figure 18.

Figure 20 is a detail cross-section taken on l1ne 202O ofF igure 19 and showing the anchor bolt connections and.the manner of connecting the channels to the supporting and reinforcing legs.

Figure 21 is a detail cross-section on line 2121 of Figure 19.-

Figure 22 is a detail cross-section similar to Figure 13 and showing a second modified form of our means for connecting the inner and outer leg members.

Figure 23 is a detail view taken on line 23--23 of Figure 20 and illustrating an interior elevation of the structure shown in Figures 18 and 19.

Figure 24 is a detail view of the structure shown in Figure 23 taken in line 24-24 of Figure 20.

Figure 25 is a detail view similar to Figure 18 but showing a modified form of our base and anchor connections. 7

Figure 26 is a cross-section taken on-line 26-26 of Figure 25.

In the drawings, our combination derrick construction is shown as comprising a light but sufliciently strong inner unit together with an outer unit structure. These inner and outer units are built that they will serve as complements to each other for the purpose of doing heavy work as in drilling wells while the inner unit may be used effectively for lighter work such as pumping, the outer unit structure being removable and applicable to other inner unit structures.

Referring particularly to Figures 3 and 4. it will be understood that the inner unit structure is made up of leg member sections 1 which are preferably of structural steel and so fabricated as to facilitate sectional field erection. More specifically, these leg member sections are shown as made of commercial angle iron and the lower orbase sections will desirably be of a heavier weight than the upper leg sections, their weights and shapes being so designed as to give maximum strength and minimum weight for a derrick to be used for pumping or other light operations.

These leg sections are provided upon the neecaee in such extensions with bolt holes 3. Splice straps 4 are also riveted to the lower ends of the leg member sections upon the outer sides of the sections and these splice straps extend below the sections in parallelism with the'faces of the angle irons 2. These extensions are provided with bolt holes 3*. It will be apparent that the angle iron 2 and the straps 1 form a socket for the reception of the upper end of the leg member section immediately beneath and, for this reason, the upper end of each section is provided with a plurality of bolt holes 3", which are so arranged as to permit of firm abutment of these leg member sections. end-to-end. Bolts placed in the holes 3, 3 and 3 will se-- cure these leg member sections together and ensure the maintenance of these sections in their end-to-end abutting relation.

The position that these leg member sections take when in this end-to-end abut-ting relation is shown in Figure 7 where these leg member motions of the inner unit structure are disclosed in conjunction with the leg-member sections of the outer unit structure which will be subsequently described. In this Figure 7, it will be seen that the leg member sections 1 are held together by; the bolts3 passing through the registering oles 3, 3 and 3". Referring again to Figures 3 and 4, it will, be noted that the inner leg member sections are provided with two additional sets of holes that may be respectively designated 5 and 6. These holes 5 and 6 are provided for the reception of bolts that serve .to hold the outer leg member sections in position, as will be subsequently described. I

In the main body of the inner unit of our derrick structure, the leg member sections are braced by means of a special bracing unit which is shown best in Figure 1. This bracing unit comprises cross arms 7 and 8, a lower girt 9 and an upper girt 10. The lower ends of the cross arms 7 and'8 are connected to the leg members just below the connections between the leg member sections. These cross arms are also connected immediately below their intersecting points to the girt 9 and they also connect to each other at their points of intersection. Furthermore, they are connected at their upper ends to both the leg member sections and "to the girt 10. the construction being preferably such that the same bolts that connect the upper ends of the cross arms 7 and 8 to the leg member sections also connect the girt 10 to such leg member sections. Some of these bracing units may comprise a substantially vertical brace 11.

As shown in Figure 21, the lower ends of each bottom leg member section is provided on opposite sides thereof with gussetplates 12. The two gusset plates 12 on each side of the derrick structure are connected by a channel 13 with the result that the lower ends of the bottom le member sections are firmly connected and braced.

Referring to Figures 18 to 24 inclusive, and more especially to Figure 2 1, it will be noted that the lower ends of the lower leg sections 1 of the inner unit structure bear directly upon base plates 14. These base plates constitute the base members of anchor structures which are designed to receive and support the derrick legs and by which these legs are securely connected to the surface upon which the derrick structure is mounted. Before proceeding with a description of these anchor structures, it is important to note that the direct contact of the lower leg sections 1 with the base plates 14 ensures that any weight placed upon the upper leg sections and transmitted therethrough by means of their end-to-end abutting relation will plates entirely independently of any bolt or rivet structure and the consequent limitations that would thereby arise due to shear ing stresses upon the bolts.

The base plates 14 are connected to the leg members 1 through the medium of bolts 15 which pass through horizontal plate portions 16 of angle members 17. These angle members 17 are in alignment with filler blocks 18 and these members 17 and 18 are clamped to the gusset plates 12 and to the legs 1 through the'medium of inclined angle members 19 and bolts 20. The horizontal portions 16 of the angle members 17 rest upon the inclined upper edges of the angle members 19 (shown best in Figure 24.) It Wlll be noted that the horizontal plate portion 16 of the angle members 17 is firmlv supported and braced by the angle 19 upoh which it rests.

At the upper end of the derrick structure, the upperleg member sections 1 directly contact with and support I-beams 21 as shown best in Figures 8, 9 and 10. In addition, there are provided side angles 22 which extend between opposite legs of the inner unit structure and which are bolted as at 23 to the I-beams 21 and as at 24 to the inner leg member sections 1. There are also provided short angle members 25 which A are bolted as at 26 to'the I-beams 21 and which are also bolted as at 27 to the inner side of the leg member sections 1. These angles 22 and 25 merely serve to ensure a rigid connection between the various parts of the top structure. The entire weight of the crown block and water table I-beams will be transmitted directly to the leg member sections 1 and through these leg member sections 1 to the base plates 14 by means of the direct bearing relations of the leg member sections to the I-beams. to each other and to these base plates 14. This direct bearing relation entirely eliminates any shearing stress upon rivets or bolts and distributes the load equally to the legs and.

inner surfaces thereof with angles 29 that are rivet-ed thereto as at 30 and that extend below the main body portions of these members 28. These angles 29 are further provided upon their inner surfaces with filler blocks 31 which-are riveted to the main body portions of the sections 28 as at 32. Disposed upon the outer surfaces of the main body portions of the leg sections 28 and at the lower end thereof are straps 33 and 34 which are secured thereto by therivets 30. These straps 33 and 34 likewise extend down below the main body portions of the sections 28 and into parallel spaced relation to the angle members 29, thereby forming sockets for the reception of the upper ends of the leg sections immediately below. These upper ends are of the form shown in Figures 5 and 6 and are provided with bolt holes 35 designed to register with bolt holes 35 passing through the filler blocks and angle plates 29 and are also designed to register with the bolt holes 35 in the plates 33 and 34. The bolts which pass through these registering bolt holes 35, 35 and 35 are shown at 36 in Figure 7 where it will be seen that these bolts also pass through the bolt holes 6 of the leg members 1. (See Figures 3 and 4.)

By inspection of Figure 7, it will be apparent that the filler blocks 31 bear firmly against the outer surfaces of the leg member sections 1 and effect a rigid bracing action. By inspection of this Figure 7 and also of Figures 5 and 6, it will be noted that the leg member sections 28 of the outer unit of our derrick structure are provided at intermediate points with filler blocks 37 which are secured to the inner surfaces of such. leg member sections by rivets 38 and which are likewise provided with bolt holes 39 that are designed to register with bolt holes 5 in the inner leg member sections 1. It is important to note that the outer leg member sections are disposed in staggered relation to the inner leg member sections 1. Thus, it will be seen that the joint between the outer leg member sections in Figure 7 is approximately intermediate the length of the inner leg member section 1. ()n the other hand, the filler blocks 37 of the outer leg member sections lie against the inner leg member sections. This greatly enhances the strength and rigidity of the structure.

A modified filler block construction is shown in Figure 22 wherein it will be seen that a filler block 40 is disposed between the inner leg member sections 1 and the 43 and 44 which pass through apertures in the ends of the plates 41 and 42-and' the filler block 40 without passing through the inner or outer leg member sections. This filler block construction is preferably placed upon the leg member sections at a point immediately above the sockets which join such leg member sections so that there will be no danger of the clamping structure slipping down out of its proper position.

A modified form of clamping and filler block construction'is shown in Figure 13. This structure is such as to permit of the use of a single bolt and of a single filler block to effect rigid clamping of the inner and outer leg member sections together. In this form, a single bolt 45 is utilized and upon it is mounted a conical washer member 46 which is designed to fit the inner angle of the leg member 1. In conjunction with this member 46, we utilize a filler block 47 which is designed to fit the exterior angle of the leg member 1 and which contacts with the base of a conical washer member 48 that is designed to fit the interior angle of the outer leg members 28. There is further provided a washer element 49 which fits the exterior angle of the leg member section 28. The manner in which these elements cooperate will be apparent from an inspection of Figure 13. The elements 46 and 48 are interchangeable and the elements 47 and 49 are likewise interchangeable.

A- modified form of base structure is shown in Figures 25 and 26 and in this form, the anchor bolt 50 which extends downwardly from the base plate passes about such base plate. through horizontal base portions 51 and 52 of superimposed angles whose vertical legs are respectively shown at 53 and 54. hi this form, the channel members 13 are cutaway as at and extend directly in overlapping relation to the leg member sections. These extensions are spaced from the leg member sections by filler blocks 56 and are connected by means of the bolts 57 passing through the vertical legs 53 and 54 of the angles, the extensions of the channels. the tiller blocks 56. the inner and outer leg members and the filler blocks interposed between such inner and outer leg members.

It will be seen that we have provided a novel and simple type of derrick construction which is amply rigid and well adapted to heavy duty but which may be partially dismantled so that a portion of it may be utilized in performing light duty while the heavy parts may be used in connection with other derrick structures. lt will lit further noted that the sections oi our outer unit are of Our inner unit which not only facilitates erection but. greatly enhances the rigidity and strength of the entire derrick structure.

It will further be noted that both our inj ner and outer units are so constructed and so cooperate that the weights placed upon the inner and outer member sections will be transmitted from the top of the derrick to the base without dependence upon any. bolts which would be subjected to shearing stresses. I

It will further be obvious that our derrick structure combines sections which have anv interfitting relation, sections which are provided with spacer or filler blocks preferably carried by the sections themselves together with juncture points that are a short distance above the girts so that erection is facilitated. There are numerous features involved in the combination of elements which go to make up our derrick structure.

Having thus described our invention, what we claim is:

1. In a derrick structure for oil, gas and artesian wells, a main tower and a supplemental tower, said towers cooperating to divide the load between them and having in. substantiatly common base and a substantially common axis, and said main and supplemental towers being separable, whereby the main tower will remain complete after separation.

2. In a derrick structure for oil, gas and artesian wells, a main tower ha'vin legs, suitable for light work, and a rein orcing tower having. legs, detachably connectible thereto, the legs of the reinforcing tower reinforcing the legs of the main tower and the whole forming a tower suitable for heavy -work, both towers having a substantially common base and a substantially common axis and supporting a common load when both towers are connected together, the reinforcing tower being detachable from the main tower without dismantling the main tower.

3. In a derrick structure for oil, gas and artesian wells, a main tower suitable for light work, and a reinforcing tower detachably connectible thereto, both towers when connected together having a substantlally common base and a substantially common axis and. supporting a common load and forming a tower suitable for heavy work, the reinforcing tower being detachable from the main tower without dismantling the main tower.

4. In a derrick structure for oil, gas and artesian wells, a tower having legs, suitable for light work, and a reinforcing structure having legs detachably connectible thereto, the legs of the reinforcing structure reinforcing the legs of the tower, said tower and reinforcing structure having a substantially common base and a substantially common axis and supporting a common load, and the whole forming a tower suitable for heavy work when the reinforcing structure is connected to the tower, the reinforcing structure being detachable from the tower without dismantling the tower.

5. In a derrick structure for oil, gas and artesi an wells, a. tower suitable for light work and removable reinforcing units comprislng a plurality of lengths of structural metal, and means for detachably connecting said lengths of structural metal to each other and to said tower, said tower and said reinforcement having a substantially common base a substantially common axis and supporting a common load, the whole when connected together forming a tower suitable for heavy work, said reinforcing units being removable from the tower without dismantling the tower.

6. In a derrick structure for oil, gas and artesian wells, a main tower having legs, suitable for light work, and a reinforcing tower having legs, detachably connectible thereto, the legs of the reinforcing tower reinforcing the legs of the main tower and [the whole forming a tower suitable for heavy work when both towers are connected together, said towers when connected together having a substantially common base and a substantially common axis and supporting a common load, one of said towers being of structural metal and both being fabricated for connection or separation with out dismantling the main tower.

7. In a derrick structure for oil, gas and artesian wells, a main tower having leg members, a reinforcing tower having leg members, said towers supporting a common load when both towers are connected together and having a substantially common base and a substantially common axis, means for fixedly connecting the legs of said reinforcing tower to the legs of said main tower against movement thereon, and spacer means between the legs of said reinforcing tower and the legs of said main tower, said reinforcing leg members being detachable from said main leg members, whereby said towers are separable to leave said main tower complete after separation.

8. Derrick structure for oil, gas and artesian wells comprising an inner tower formed in sections, an outer tower formed 1n sections aranged in staggered relation to the sections of said inner tower, and spacing means between said inner and outer towers.

9. In a derrick structure for oil, gas and artesian wells, a main tower having leg members, a reinforcing tower having leg members, said towers supporting'a common load when both towers are connected together and having a substantially common base and a substantially common axis, means for fix tilt edly connecting the legs of said reintorcing tower to the legs of said main tower against. movement thereon, and spacer means between the legs of said reinforcing tower and the legs of said main tower, said reinforcing leg members being detachable from said main leg members, whereby said towers are separable to leave said main tower complete after separation, said spacer means being permanently carried on one of said leg members.

10. Derrick structure for oil, gas and artesian wells comprising an inner tower structure and an outer towei structure each structure comprising a plurality of leg sections, socket connections between said leg sections, and spacing means between said inner tower and the leg sections of said outer tower at said socket connections.

11. Derrick structure for oil, gas and artesian wells comprising an inner tower structure and an outer tower structure each structure comprising a plurality of leg sections, socket connections between said leg sections, spacing means between said inner tower and the leg sections of said outer tower at said socket connections, and a spacing means intermediate the length of the sections of said outer tower leg members.

12. Derrick structure for oil, gas and artesian wells comprising an inner tower structure and an outer tower structure each structure comprising a plurality of leg sections, socket connections between said leg sections, and spacing means carried by said socket connections.

13. Derrick structure for oil, gas and artesian wells comprising inner tower leg sections, outer tower leg sections arranged in staggered relation to said inner tower leg sections, spacing means in between the juncture points of said outer tower leg sections and intermediate points on said inner tower leg sections.

14. Derrick structure for oil, gas and artesian wells comprising inner tower leg sections, outer tower leg sections arranged in staggered relation to said inner tower leg sections, spacing means in between the juncture points of said outer leg sections,'intermediate points on said inner tower leg sections and spacing means adjacent the juncture points of said inner tower leg sections.

15. Derrick structure for oil, gas and artesian wells comprising inner tower leg sections, outer tower leg sections arranged in staggered relation to said inner tower leg sections, spacing means between the juncture points of said outer leg sections, intermediate juncture points on said inner tower leg sections and spacing means immediately below the juncture points of said inner tower leg sections.

16. Derrick structure for oil, gas and artesian wells comprising an inner tower, an

outer tower, a base structure, and a top structure, said inner and outer towers both extending over the base structure to the top structure and comprising sections in end to end abutting relation and being'so connected to said base structure and said top structure that the weight of the top structure will be directly transmitted to the base structure without shearing stress on any bolts.

17 Derrick structure for oil, gas and artesian wells comprising an inner tower, an outer tower, base plates, and means for connectin the said towers together and to said base p ates, said inner and outer towers both extending over the base structure to the top structure and being so constructed and assembled that the ends thereof and the entire weight of the derrick structure will bear directly against said base plates.

18. Derrick structure for oil, gas and artesianwells comprising an inner tower, an outer tower and an anchor bolt supporting structure formed and carried by the base connection of said inner and outer towers.

19. Derrick structure for oil, gas and artesian wells comprising an inner tower, an outer tower and anchor supporting and bracing means carried by said inner and outer towers.

20. Derrick structure for oil, gas and artesian wells comprising an inner tower, an outer tower and anchor supporting and bracing means carried by the base connections of said inner and outer towers.

21. Derrick structure for oil, gas and artesian wells comprising an inner tower, an outer tower and a base structure formed by connecting the lower ends of said inner and outer towers.

22. Derrick structure for oil, gas and artesian wells comprising an inner tower formed in sections, an outer tower formed in sections and means for securing the base section of said outer tower to the base section of said inner tower, said means and said base sections forming thereby a base structure and also carrying means for an choring said base structure.

23. Derrick structure for oil, gas and artesian wells comprising inner tower leg sections, outer tower leg sections, means for securing the base leg sections of said outer tower to the base leg sections of said inner tower, said means and said base leg sections forming thereby a complete base structure.

24. Derrick structure for oil, gas and artesian wells comprising inner tower leg sections, outer tower leg sections, means for securing the base leg sections of said outer tower to the base leg sections of said inner tower, said means and said base leg sections forming thereby a complete base structure, and also carrying means for anchoring said base structure.

25. Derrick structure for oil, gas and armeans for connecting the inner and outer.

towers and the respective leg members of each tower to form a base structure, said members also comprising anchor structure carrying and bracing means.

27. Derrick structure for oil, gas and artesian wells comprising inner tower leg sec tions, outer tower leg sections arranged in staggered relation to said inner tower sections, spacing means between said inner and outer tower sections at the connections of said outer tower sections and adjacent the connections of said inner tower sections, base plates, a base structure formed by connecting the lower ends of said inner and outer tower leg sections, said connecting means also carrying means for anchoring said derrick to said base plates, a top structure, and means for securing said inner and outer towers to said top structure, said lastnamed means and said towers being so constructed and assembled that the weight of the top structure will be directly transmitted to the base plates Without shearing stress on any bolts.

28. Derrick structure for oil, gas and artesian wells comprisingspecially fabricated inner tower leg sections, specially fabricated outer tower leg sections arranged in staggered relation to said inner tower leg sections, socket connections on the base of said leg sections to receive the upper ends of adjacent leg sections, said leg sections being disposed in direct abutting relation,

filler blocks between said inner and outer leg sections at said outer socket connections and adjacent said inner socket connections and permanently attached,to said outer leg sections, a top structure, means for securing thetop inner and outer leg sections together and to the top structure so. that the top'of the leg sections bear directly against said top structure, and means for securing the base leg sections of's'aid outer tower to the base leg sections of said inner tower, said means and said base sections forming thereby a complete base structure, said lastnamed means also comprising anchor structure carrying and bracing means.

.29. Derrick structure for oil, gas and artesian wells comprising specially fabricated inner tower leg sections, specially fabricated outer tower leg sections arrangedin staggered relation to said inner tower leg sections, socket connections on the base of said leg sections to'receive the upper ends of.- adjacent leg sections, said leg sections being disposed in direct abutting relation, filler blocks between said inner and outer leg sections at said outer socket connections and adjacent said inner socket connections,

a top structure, means for securing 'thetop: inner and outer leg sections together and to the top structure so-that thetop'of the leg sections bear directly against said top structure, and means for securing theba-se leg sections of said outer towerto said inner tower, and base plates" against which said base leg sections bear directly,-said'securing means and said base sections forming'a com; plete base structure and embodying an anchor structure carrying and bracing means.

In testimony whereof we hereby afiix our signatures.

GORDON BATTELLE. HARRY M. RUNKLE. WILLIAM B. TORI 

